Bug#34417 Assertion failure in Diagnostics_area::set_error_status()

  
The Diagnostic_area caused an assertion failure in debug mode when
the disk was full.
  
By setting the internal error handler to ignore errors caused by
underlying logging methods, the error is avoided.

sql/log.cc

@@ -741,10 +741,14 @@ bool Log_to_file_event_handler::
            ulonglong query_utime, ulonglong lock_utime, bool is_command,
            const char *sql_text, uint sql_text_len)
 {
-  return mysql_slow_log.write(thd, current_time, query_start_arg,
-                              user_host, user_host_len,
-                              query_utime, lock_utime, is_command,
-                              sql_text, sql_text_len);
+  Silence_log_table_errors error_handler;
+  thd->push_internal_handler(&error_handler);
+  bool retval= mysql_slow_log.write(thd, current_time, query_start_arg,
+                                    user_host, user_host_len,
+                                    query_utime, lock_utime, is_command,
+                                    sql_text, sql_text_len);
+  thd->pop_internal_handler();
+  return retval;
 }
 
 
@@ -760,9 +764,13 @@ bool Log_to_file_event_handler::
               const char *sql_text, uint sql_text_len,
               CHARSET_INFO *client_cs)
 {
-  return mysql_log.write(event_time, user_host, user_host_len,
-                         thread_id, command_type, command_type_len,
-                         sql_text, sql_text_len);
+  Silence_log_table_errors error_handler;
+  thd->push_internal_handler(&error_handler);
+  bool retval= mysql_log.write(event_time, user_host, user_host_len,
+                               thread_id, command_type, command_type_len,
+                               sql_text, sql_text_len);
+  thd->pop_internal_handler();
+  return retval;
 }